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TitleThe Pliocene Shelburne mass-movement and consequent tsunami, western Scotian Slope
AuthorMosher, D CORCID logo; Xu, Z; Shimeld, J
SourceSubmarine mass movements and their consequences; by Mosher, D CORCID logo (ed.); Shipp, R C (ed.); Moscardelli, L (ed.); Chaytor, J D (ed.); Baxter, C D P (ed.); Lee, H J (ed.); Urgeles, R (ed.); Advances in Natural and Technological Hazards Research vol. 28, 2010 p. 765-775, 62
Alt SeriesEarth Sciences Sector, Contribution Series 20090328
PublisherSpringer Netherlands
MeetingSubmarine mass movements and their consequences, 4th International Symposium; Austin, Texas; US; November 7 - 12, 2009
Mediaon-line; digital; paper
RelatedThis publication is contained in Submarine mass movements and their consequences
File formatpdf
ProvinceEastern offshore region
AreaScotian slope
Lat/Long WENS-65.0000 -63.0000 43.0000 41.7500
Subjectssedimentology; geophysics; marine geology; mass wasting; sediment transport; transport mechanisms; submarine transport; sedimentation; seismicity; Pliocene; sedimentation rates; Pleistocene; seismic reflection surveys; slope failures; tsunami; landslides; Tertiary; Quaternary; Cenozoic
Illustrationslocation maps; profiles; graphs
ProgramOffshore Geoscience, Geoscience for East Coast Offshore Developments
AbstractSubmarine mass-movement is a significant process along continental margins, even along passive margin slopes. Interpretation of seismic reflection profiles along the Scotian margin, for example, indicates the Cenozoic section is dominated by mass transport deposits (MTD) at a spectrum of scales. Occasional exceptionally large MTDs are observed which seem particularly foreign in a passive continental margin setting. The Shelburne MTD was recognized from exploration industry seismic reflection data along the western Scotian Slope. It is a buried Plio/ Pleistocene feature that extends in excess of 100 km from the upper slope to the abyssal plain and maps to an area in excess of 5,990 km2 and a volume >862 km3. Its features demonstrate that it is a frontally-emergent MTD with a slump portion and a debris flow/run-out portion. Tsunami simulations were generated for this event, one assuming the slump portion generated the tsunami, the other, both the slump and debris flow contributed. For a mass movement comparable in scale to the Shelburne MTD, these simulations demonstrate that the city of Halifax, Nova Scotia, would be impacted within 70 to 80 minutes by a 13-25 m high wave, depending on the MTD source volume (slump or slump and debris field).

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